Reservoir-pen.



PATBNTBD JULY 18, 1905.

W. W. SANFORD.

RESERVOIR PEN.

APPLICATION FILED SEPT. 2, 1904.

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UNITED STATES Patented July 18, 1905.

PATENT OEETCE.,

WILLTAM W. SANFORD, OF NEWARK, NEW JERSEY, ASSIGNOR OF ONE- HALF TOFREDERICK D. BENNETT, OF FREEHOLD, NEW JERSEY.

RESERVOIR-PEN.

SPECIFICATION forming part of Letters Patent No. 794,814, dated July18,1905.

Application led September 2, 1904. Serial No. 223,164.

To rr/ZZ w/tcm, t may concern:

Be it known that I, WVILLIAM W. SANFORD,

a citizen of the United States of America, and I a resident of Newark,in the county of Essex, State of New Jersey,have invented certain newand useful Improvements in Reservoir-Pens,

struction of the pens that the reservoir can be f filled with ink simplyby drawing up a plunger in the reservoir and that after the reservoir isfull of ink the stem of the plunger may be disengaged therefrom by asimple move- -ment and carry a valve to a seat at the pen end of saidreservoir, `so as to tightly close that end, while at the same time thesaid plunger remains at and tightly closes the other end of thereservoir, thereby eifectually pre.- venting leakage and also permittingthe stem of the said plunger to be pushed down into the reservoir aftersaid reservoir is filled, whereby the length of the pen and caps isgreatly reduced and the inconvenience in the use of plunger-pens asheretofore constructed is overcome.

The invention also avoids the necessity of two caps, one for the pen andone for the stem, when the pen is not in use, since no cap is nowrequired for the stem, which is pushed into the reservoir.

Therefore this invention consists, essentially, in the combination inreservoir-pens of a plunger and stem therefor which are only temporarilyconnected together, so that at one time the stem will operate theplunger to draw in ink or to carry the plunger down to the pen end ofthe reservoir to begin the suction and at another' time will bedisengaged from the plunger', so that the stem and the valve it carriesmay be operated without moving the plunger, and my invention broadlycovers the combination in reservoir-pens of a plunger, stem, and meansof temporary connection between them however the connection may beeffected.

Referring to the drawings which accompany the specification, and whichshow the invention applied to a fountain-pen, Figure 1 is a longitudinalsection of the pen with the parts in the position for carrying the penin the pocket. Fig. 2 is a longitudinal section of the pen with theparts in the position of filling the reservoir. Fig. 3 is a brokensectional elevation with the valve slightly retracted from its seat.Fig. L is an enlarged sectional detail of the plunger engaged with thethreads of the stem. Fig. 5 is a similar view of the plunger disengagedfrom the threads on the stem. This view also shows part of the reservoirand the threaded plug which closes the end thereof.

Referring to Figs. 1 to 5, in the reservoir 1 is threaded thepen-section 2, whichis provided with a conical valve-seat 3, on whichseats a valve 5, which is carried on the end of the plunger-stem 7. Saidvalve-seat might of course he formed on the end of the reservoir. Saidstem 7 extends axially through the plunger 8 out through the femalethreaded plug 25, which closes the end of said reservoir 1, and has onits outer end a knob 24,

provided with male threads 23, which engage with the threads of saidplug 25 when the valve 5 is forced home to its seat, Fig. 1. At a pointa little distant from said valve 5 said stem 7 is provided with threads9, which sometimes engage with and at other times are disengaged fromcorresponding threads on said plunger 8, said threads on said stem andplunger constituting one form of the means for connecting said stem andplunger. The

said plunger 8 preferably comprises a shouldered hollow plug 11,provided with female threads 12 to engage with said threads 9. The saidthreaded part of said plug 11 is shorter than the distance between saidvalve 5 and said threads 9, Fig. 5, and behind Said threads 12 said plug11 has a larger throughbore without threads to freely admit the saidthreads 9 in a certain position of said stem, Fig. 5. Said plug 11threads into a sleeve 1&1, which is chambered to admit a ring 15, ofrubber, prepared cork, or other suitable material, which makes awater-tight joint around said stem'7. A ring 17 of similar materialpositioned on said sleeve 14 between the shoulder of said plug 11 andthe head 18 of said sleeve makes air-tight fit with the trulycylindrical inner surface of said reservoir 1. As an additionalprovision for certainly freeing said plunger 8 from said stem 7 I preferto provide a groove 19 in the head 18 of said sleeve 14, which isadapted to engage a rib 2O on the end of said plug 25. as will behereinafter more particularly explained.

The operation of the parts hereinbefore described is a's follows: Whenit is desired to lill the reservoir 1 with ink, the threads on stem 7being preferably then engaged with the threads on the plunger 8, thesaid stern is pushed inwardly, carrying the plunger with it. rIhe pen 30then being' inserted in ink, the said stem and plunger are pulled up,sucking ink into said reservoir 1 until said plunger comes against saidplug 25. Now turning the said stem 7 a few turns to the right will carrythe threads 9 on said stem 7 out of plunger 8, the friction of theplunger in the reservoir 1 and the engagement of the said groove 19 withthe said rib 2() preventing said plunger from turning. Then the stem ispushed inwardly without displacing the ink in the reservoir, the plungerremaining' at the upper end thereof until the valve 5 is just coming toits seat 3, when the threads 23 on said stem 7, coming into mesh withthe threads in said plug 25, enable the said valve to be pressed tightlyto its seat. rIhe reservoir is now tightly closed at both ends and maybe carried in the pocket without fear of leakage of ink, the usual cap31 being provided to protect the pen 30 and to cover the knob 24 whenwriting, as is usual. To use the pen, the valve 5 is withdrawn from itsseat by giving the knob 24 a few turns to the left and ink then flows tothe pen. 'Io refill the reservoir, the stem is drawn up until thethreads 9 are arrested by the plunger 8. Then by giving a few turns tothe left said threads 9 mesh with threads 12 on said plug 11 of saidplunger and the said stem and plunger are rengaged. Now by pushing thestem inwardly the plunger will also be carried inwardly to a positionfor again sucking in ink. Should the operator turn the stem too longwhen seeking to engage the stem with the plunger, the said threads 9will merely be carried into the unthreaded chamber in said plug 1l andnoharm will be done, while the stem and plunger will still be inengagement, though the stem can now be freely turned round and round inthe plunger. Should the plunger stick on the stern, yet the engagementof the said groove 2O with said rib 19 preventing said plunger fromturning will enable the stem to be disengaged from the said plunger.

Now having described my improvements, I claim as my invention- 1. In areservoir-pen, the combination of a stem provided with short threads,and a plunger provided with correspondingshort threads adapted to engagewith the threads on the stem in one position thereof and with a chamberadapted to freely receive the threads of said stem in another positionof said stem, substantially as described.

2. In a reservoir-pen, the combination of a reservoir, a stem movabletherein, a plunger movable on said stem, means for engaging said stemwith said plunger in one position whereby said stem can move saidplunger, and a shouldered chamber in said plunger adapted to receivesaid means in another position, whereby said plunger may turn freely onsaid stem and be moved thereby, substantially as described.

3. In a reservoir-pen, the combination of a reservoir, a stem movabletherein and provided with .male threads, a hollow plunger movable onsaid stern and provided with female threads adapted to engage said malethreads in one position of said plunger, and also provided with anUnthreaded chamber adapted to receive said male threads in anotherposition of said plunger whereby said plunger may turn freely on saidstem and be moved thereby, substantially as described.

4. The combination in a reservoir-pen, of a reservoir, a Stem providedwith a valve movable in said reservoir, a plunger movable on said stemand provided with packing having a suction fit on said stem and in saidreservoir, means for engaging said plunger with said stern in oneposition, and a chamber for said means in said plunger whereby saidplunger may turn freely on said stem in another position and yet bemoved thereby, substantially as described.

Signed at New Jersey this 25th day of August, 1904.

WILLIAM WV. SANFORD. Witnesses: l

HARRISON 'I`. SLossoN, FREDERICK SNOW KELLoGc.

IOO

